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                                 <span class="keyword">Dolby Vision</span>
                                 </span><div><span class="subtitle">Content Editing for Third-Party Developers</span></div>
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                                 <div data-tocid="c_introduction-d4029e80771" class="topicref" data-id="c_introduction" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../topics/c_introduction.html" id="c_introduction-d4029e80771-link">Introduction</a><div class="wh-tooltip">This documentation focuses on video editing of Dolby Vision files in an Android application,
                                          and covers support provided in a sample application for critical aspects on both graphics
                                          processing unit (GPU) and display processing unit (DPU)  platforms and corresponding
                                          Dolby Vision versions.</div>
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                                 <div data-tocid="c_display_management-d4029e80856" class="topicref" data-id="c_display_management" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../topics/c_display_management.html" id="c_display_management-d4029e80856-link">Display management</a><div class="wh-tooltip">There are two versions of Dolby Vision capture; the version present on a device depends
                                          on the display management processing unit or platform used for Dolby Vision. It is
                                          critical that an application can determine which version is present, and can run correctly
                                          on both versions. Determining the version reliably involves examining the Dolby Vision
                                          codecs present on the device.</div>
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                                 <div data-tocid="c_editing_gpu_shaders-d4029e80932" class="topicref" data-id="c_editing_gpu_shaders" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../topics/c_editing_gpu_shaders.html" id="c_editing_gpu_shaders-d4029e80932-link">Editing using the GPU shaders</a><div class="wh-tooltip">The sample application provides two GPU (graphics processing unit) shaders for editing.
                                          The DPU (display processing unit) is not used for editing, but is used for display.</div>
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                                 <div data-tocid="c_signaling_preview-d4029e81009" class="topicref" data-id="c_signaling_preview" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../topics/c_signaling_previewing.html" id="c_signaling_preview-d4029e81009-link">HLG signaling and previewing</a><div class="wh-tooltip">Adding support for Dolby Vision editing involves understanding how to process hybrid
                                          log-gamma (HLG) frames correctly so that the preview surface is aware of their format.</div>
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                                 <div data-tocid="c_chapter3-d4029e81083" class="topicref" data-id="c_chapter3" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../topics/c_trimming_remuxing.html" id="c_chapter3-d4029e81083-link">Trimming and remultiplexing</a><div class="wh-tooltip">When trimming directly on an encoded video bitstream to preserve video quality, Dolby Vision
                                          multiplexer information must be added to the MP4 file. Dolby provides a tool to do
                                          this that can be integrated into an application.</div>
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                              <h1 class="- topic/title title topictitle1" id="ariaid-title1">Glossary</h1>
                              
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                                 <section class="- topic/section section">
                                    
                                    <dl class="- topic/dl dl">
                                       
                                       
                                       <dt class="- topic/dt dt dlterm">API</dt>
                                       
                                       <dd class="- topic/dd dd">Application programming interface. A set of functions that can be used to access the
                                          functions of an operating system or other type of software.</dd>
                                       
                                       
                                       
                                       <dt class="- topic/dt dt dlterm">BT.2020</dt>
                                       
                                       <dd class="- topic/dd dd">ITU-R Recommendation BT.2020. A standard with a color space, for characterizing and
                                          encoding ultra-high-definition television.</dd>
                                       
                                       
                                       
                                       <dt class="- topic/dt dt dlterm">BT.709</dt>
                                       
                                       <dd class="- topic/dd dd">ITU-R Recommendation BT.709. A standard with a color space, for characterizing and
                                          encoding high-definition television.</dd>
                                       
                                       
                                       
                                       <dt class="- topic/dt dt dlterm">DPU</dt>
                                       
                                       <dd class="- topic/dd dd">Display processing unit. A hardware component of a Qualcomm system-on-chip (SoC) designed
                                          for accelerated processing of visual data represented as pixels.</dd>
                                       
                                       
                                       
                                       <dt class="- topic/dt dt dlterm">GPU</dt>
                                       
                                       <dd class="- topic/dd dd">Graphics processing unit. A specialized electronic circuit designed for optimal use
                                          of memory and accelerated processing to create images in a frame buffer for output
                                          to a display device.</dd>
                                       
                                       
                                       
                                       <dt class="- topic/dt dt dlterm">HDR</dt>
                                       
                                       <dd class="- topic/dd dd">High-dynamic-range imaging. A technique used in imaging and photography to reproduce
                                          a greater dynamic range of luminosity than what is possible with standard digital
                                          imaging or photographic techniques. The aim is to present a similar range of luminance
                                          to that experienced through the human eye.</dd>
                                       
                                       
                                       
                                       <dt class="- topic/dt dt dlterm">HLG</dt>
                                       
                                       <dd class="- topic/dd dd">Hybrid log-gamma. High-dynamic range standard format developed jointly by the British
                                          Broadcasting Corporation (BBC) and Nippon Hoso Kyokai (Japan Broadcasting Corporation),
                                          and defined in ARIB STD‑B67 and ETSI TS 101 154.</dd>
                                       
                                       
                                       
                                       <dt class="- topic/dt dt dlterm">HLS</dt>
                                       
                                       <dd class="- topic/dd dd">HTTP Live Streaming. An adaptive streaming protocol developed by Apple for delivery
                                          of media content in various software environments.</dd>
                                       
                                       
                                       
                                       <dt class="- topic/dt dt dlterm">IEEE</dt>
                                       
                                       <dd class="- topic/dd dd">Institute of Electrical and Electronics Engineers. </dd>
                                       
                                       
                                       
                                       <dt class="- topic/dt dt dlterm">JNI</dt>
                                       
                                       <dd class="- topic/dd dd">Java Native Interface. </dd>
                                       
                                       
                                       
                                       <dt class="- topic/dt dt dlterm">LUT</dt>
                                       
                                       <dd class="- topic/dd dd">Look-up table. In the context of Dolby Vision, a series of precalcuated display management
                                          data stored in a static text file that saves processing time and cycles for display
                                          management.</dd>
                                       
                                       
                                       
                                       <dt class="- topic/dt dt dlterm">MPEG‑DASH</dt>
                                       
                                       <dd class="- topic/dd dd">MPEG Dynamic Adaptive Streaming over HTTP. An adaptive bit-rate streaming protocol
                                          that enables high-quality streaming of media content over the Internet delivered from
                                          HTTP.</dd>
                                       
                                       
                                       
                                       <dt class="- topic/dt dt dlterm">SDR</dt>
                                       
                                       <dd class="- topic/dd dd">Standard dynamic range. An ITU-R BT.709 signal with peak luminance of 100 cd/m².</dd>
                                       
                                       
                                       
                                       <dt class="- topic/dt dt dlterm">SoC</dt>
                                       
                                       <dd class="- topic/dd dd">System-on-chip. An integrated circuit that integrates all components of an electronic
                                          system into a single chip.</dd>
                                       
                                       
                                       
                                       <dt class="- topic/dt dt dlterm">YUV</dt>
                                       
                                       <dd class="- topic/dd dd">A file format that is encoded using the YCbCr color space.</dd>
                                       
                                       </dl>
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